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anyone have problems other than just calculating illuminance or number of luminaires?

thanks for your guys help

Yea I have the MVA method down though want to make sure I understand calculating using per-unit also. There are a lot of formulas using per-units that I'm not familiar with - like Ssc = Spu/Zpu. Is there a good reference showing how these are derived? Though I think I'll just keep with what I...

is the solution wrong by saying "Ssc = 1/Zpu = 2.75pu" - isn't this Isc unless it is V2/Z i didn't use Isc i used MVAsc = MVA base / Zpu to get the answer. can someone please explain this simple thing to my crazy brain?

i just tried and it is up.

yea my brain is beat - sorry. forgot to * 500' and divide by 1000' which is /2. thanks

this one sort of lost me. what is the impedance dividing? is this just (V^2)/Z

Thanks. Guys I did the calculation as r1*r1/(r1+r1) and of course it is an answer though wrong according to the ncees. they just find the impedance and divide by 2.

anyone have good material for non-linear problems? this is the only subject I feel week in and thought i might study a little deeper this week. any online material would be great.

if the conductors were rated at a different temp would the calc be the same?

I sent Josh an email about errata and on Oct. 15th he stated "I apologize for the delay. We are in the middle of relocating our business. My partner has sent me the errata and responses to your questions here and on the forum. I'll send those out in a few days this coming week. Thank you...

Josh sent an email to me stating errata will be provided on some problems. that was on 10/15/2011 and no word from him. I emailed him again asking and just waiting.

awesome! thanks for the help on this. I think if i stop working these kaplan problems I'll be good!!!! have the morning done and will hopefully finish the rest here shortly. thanks for pointing out the real power differences in the solutions - something definitely to look for on the exam...

so you think i shouldn't be getting freaked out about having problem with some of these? the complex imaginary were pretty easy though not sure if that means anything.

thanks. these problems are definitely harder than the ncees so i want to keep tackling them even though it makes you second guess your self a lot. Seems like the comlex imaginary are too easy and the camara are focusing on the EERM. if the exam is like the ncees practice I'll do alright. if...

yea that makes perfect since though still not sure what the heck I'm doing wrong!!! Here is a pic of the problem. thanks again for looking at this

thanks for the help. on 2). i take the generation voltage of 45kV and divide by 138kV to get pu (the problem stated the pu voltage was 138kV. I then take Vpu*conj(Ipu)*sqrt(3). this is where I get stuck. I'm in kva per-unit. and believe Im not converting to the generation kva base and...

the book definitely calculated the generator pu voltage wrong. Though I am getting two different answers when working different ways so I might need a little lesson! Give that the pu current is 0.059-0.01078j and the base is 240MVA. The generator Voltage line-line is 45kv and is the...

complex version 1 problem #20 also DK thanks for the good explanation.

I just emailed Josh again asking about for the solution. If I don't hear a response by tomorrow morning I'll email the GA Tech person whom is very quick at responding.